code: def test_functionality_es2():
      """Test es2 GL backend for full functionality."""
      if True:
          raise SkipTest("Skip es2 functionality test for now.")
      if not sys.platform.startswith("win"):
          raise SkipTest("Can only test es2 functionality on Windows.")
      _test_functionality("es2")
  
file_path: vispy/vispy/gloo/gl/tests/test_functionality.py
imports: import sys
  import numpy
  from vispy.app import Canvas
  from vispy.testing import requires_application, requires_pyopengl, SkipTest, run_tests_if_main, assert_equal, assert_true
  from vispy.gloo import gl
  import pytest
label_desc: Use image node_id 5 for calling a global function with example usage: test_functionality_es2() without return types